i18n(site): convert Hugo i18n TOML->go-i18n JSON for Weblate

Weblate has no native Hugo-TOML format. The strings are already the go-i18n
structure ([key]/other=), so convert site/i18n/{en,es}.toml -> {en,es}.json
({"key":{"other":"..."}}) — Hugo 0.140 reads it identically (verified with the
pinned hugomods/hugo:exts-0.140.2 image). Enables a 'site' Weblate component.

Update TRANSLATIONS.md: site is now a component (go-i18n-json), not deferred.

site/i18n/en.json

@@ -0,0 +1,140 @@
+{
+  "skipToContent": {
+    "other": "Skip to content"
+  },
+  "navAbout": {
+    "other": "About"
+  },
+  "navLegal": {
+    "other": "Legal"
+  },
+  "navHome": {
+    "other": "Home"
+  },
+  "screenshotsTitle": {
+    "other": "A look inside"
+  },
+  "getItTitle": {
+    "other": "Get Tane"
+  },
+  "getItComingSoon": {
+    "other": "Publishing to app stores soon. Meanwhile, Tane is free software you can build and run today."
+  },
+  "legalIntro": {
+    "other": "The plain-language documents that govern Tane. Short version: your data stays on your device, Tane is only a tool, and you are responsible for the seeds you share."
+  },
+  "footerFreeSoftware": {
+    "other": "Free software (AGPL-3.0). No ads, no commissions, no data selling."
+  },
+  "footerPublishedBy": {
+    "other": "Published by"
+  },
+  "footerContact": {
+    "other": "Contact"
+  },
+  "backToHome": {
+    "other": "Back to home"
+  },
+  "statusBadge": {
+    "other": "Beta"
+  },
+  "statusTitle": {
+    "other": "Where Tane is right now"
+  },
+  "statusBody": {
+    "other": "The inventory works today: keep your seeds offline, encrypted, with no account. The neighbourly sharing layer (offers, messaging, trust) is being built now. Everything already works with zero network."
+  },
+  "screenCapHome": {
+    "other": "Home — your bank and the market, one tap away"
+  },
+  "screenCapInventory": {
+    "other": "Inventory — your seeds, grouped by family"
+  },
+  "screenCapMarket": {
+    "other": "Market — give, swap or sell with people nearby"
+  },
+  "screenCapCalendar": {
+    "other": "Calendar — what to sow this month"
+  },
+  "screenCapDetail": {
+    "other": "Variety — years, quantities, origin, germination"
+  },
+  "rtlNoteTitle": {
+    "other": "International by design"
+  },
+  "rtlNoteBody": {
+    "other": "Right-to-left and non-Latin scripts are first-class. Here is the inventory mirrored for RTL."
+  },
+  "collabTitle": {
+    "other": "Get involved"
+  },
+  "collabIntro": {
+    "other": "Tane has no business model — it lives on volunteers, communities and public tech grants. You can help:"
+  },
+  "collabTranslateT": {
+    "other": "Translate"
+  },
+  "collabTranslateB": {
+    "other": "Bring Tane to your language. Translation files are simple; patches are welcome."
+  },
+  "collabTestT": {
+    "other": "Try it with a seed group"
+  },
+  "collabTestB": {
+    "other": "Use it in a real seed network or fair and tell us what breaks or what's missing."
+  },
+  "collabCodeT": {
+    "other": "Contribute code"
+  },
+  "collabCodeB": {
+    "other": "Flutter/Dart, free software. Design docs and tests included."
+  },
+  "collabFundT": {
+    "other": "Support it"
+  },
+  "collabFundB": {
+    "other": "No ads, no commissions. Help fund the work or point us to grants for the commons."
+  },
+  "collabContact": {
+    "other": "Write to us"
+  },
+  "faqTitle": {
+    "other": "Questions"
+  },
+  "faqFreeQ": {
+    "other": "Is it free?"
+  },
+  "faqFreeA": {
+    "other": "Yes. Free software (AGPL-3.0), no ads, no commissions, no data selling."
+  },
+  "faqAccountQ": {
+    "other": "Do I need an account?"
+  },
+  "faqAccountA": {
+    "other": "No account, no sign-up, no server. Your data stays on your device."
+  },
+  "faqOfflineQ": {
+    "other": "Does it work offline?"
+  },
+  "faqOfflineA": {
+    "other": "Fully. The internet only enriches it; everything essential works with no connection."
+  },
+  "faqLegalQ": {
+    "other": "Is it legal to share seeds?"
+  },
+  "faqLegalA": {
+    "other": "Giving and swapping between growers is broadly allowed; selling can be regulated. You are responsible for what you share — see the notice on seed legality."
+  },
+  "faqDataQ": {
+    "other": "What about my privacy?"
+  },
+  "faqDataA": {
+    "other": "Data is encrypted on your device and only what you explicitly share ever leaves it. See the privacy policy."
+  },
+  "aboutCta": {
+    "other": "Learn what Tane is"
+  },
+  "footerSource": {
+    "other": "Source code"
+  }
+}